main {
    /* background-image: url(../images/background_1.jpg); */
    background: linear-gradient(to right, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.2)),
                url(../images/background_2.jpg);
    background-size: cover;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-position: center;
}